Regulating magnet-controller for electric elevators.



N0. 879,789. PATENTED FEB. 18, 1908. H. P. McGOLL. REGULATING MAGNETCONTROLLER FOR ELECTRIC ELEVATORS.

APPLICATION FILED MAY 29, 1906. RENEWERAUG. 7, 1907.

Siam-m wnNEssEs, INVENTOR, g a HENRY DERCY M COLL, l av S v ATTQRNEY.

7n NORRIS PETERS 50., WASHINGTON, :7. cv

HENRY PERCY MCCOLL, OF HAWTHORN, VICTORIA, AUSTRALIA.

REGULATING MAGNET-CONTROLLER FOR ELECTRIC ELEVATORS.

Specification of Letters Patent.

Patented Feb. 18, 1908.

Application filed May 29 1906. Serial No. 319.249- Renewed August '7.1907. Serial No. 387.566.

To all whom it may concern:

it known that I, HENRYPEROY MoCoLL, a subject 01 the King of GreatBritain, residing at No. 16 Edward. street, Hawthorn,- inv vators, ofwhich the following is a specifica- I tion.

This invention has been. devised with the object of providing meanswhereby electric elevators may be more eliiciently controlled and thusto obviate the tendency of such cars to over-run their limits both atthe top and bottom of their travel, and, furthermore, to obtain a moregradual starting and stopping without the inconvenience of erks andjolts, and also to enable the speed to be regulated at will.

The invention. is illustrated. by the accompanying diagrams wherein,-

Figure 1 shows the arrangement of circuits in a three wire system, whileFig. 2 is a similar view to part of Fig. 1 showing the circuits of a twowire system.

B cl'erring now to these drawings it will be seen. that in the circuitsthere are placed solenoidsl, 1, 1', provided withmovable iron cores 2arranged and constructed in the following manner. One of said solenoids1 is wound as a double solenoid, that is to say, one end is wound in adifferent manner to the other and is in a different circuit. The core 2of this solenoid is provided at one end with a rod or projection 3 ofnon-magnetic material which is attached to one end of a rhe'ostat lever4 whose other end contacts successively with a set of contacts 5connected. to the usual armature resistance 6 and. series held 7 insuitable circuits. Instead of the lever 41 other suitable mechanicaldevices may be employed for the same purpose. The winding 8 of the lowerend of this double solenoid l is connected when in circuit directlyacross the mains and another windii'ig 8 on the same end is placed inseries with the armature circuit. The direction of winding 8 opposes andneutralizes the action of the winding 8* on the upper end of saidsolenoid and assists the winding 8 on the lower end thereof.

The windings 8 and 8 tend to pull the above-mentioned lever 4 in thedirection as indicated by an arrow and so place all the resistance intocircuit. For this reason the coils at the bottom end of the solenoid 1are termed the slow coils. The other end of this solenoid has a windingor fast coil 8 (mentioned above) which when put in circuit is connectedacross the terminals of the armature and therefore its strength variesdirectly as the speed of the motor, and influences the core in theopposite direction. It will be understood that when the armature is atrest there is no current flowing through winding 8 and therefore thereis no pull on the lever and no resistance can be cut out until thearmature is started. It will be understood that instead of this doublesolenoid two separate solenoids may be used to operate the rheostat inthe same manner. Above this double solenoid is a single solenoid 1connected with a circuit 9 and so arranged as to insure that the mainline switch 10 is closed and the shunt field 11 and brake 12 are incircuit when the car-switch is on contact 25. The core of said solenoid1 is provided with an insulated disk 13 and rests upon the rheostatlever 1 or rod 3 of the solenoid 1 and holds said lever down therebyinsuring that the lever 4 is in the startingposition and all armatureresistance is in circuit and also that the main line switch 10 brakeswitch 12 and shunt field switch 11 are open.

The lever 4. is balanced and adjusted so that when the core of thesolenoid 1 is raised thus permitting free movement it will remain inwhatever position it is placed when not under the influence of thedouble solenoid coils. In connection with this lever a dash pot or asimilar contrivance may be em.- ployed to prevent said lever moving toosuddenly. The apparatus also includes reversing switches S S foroperating the armature in either direction. Said switches are controlledby solenoids 1 the cores of which are provided with two insulatedcontact disks 16, 16 or their equivalents Contacts 17 are provided aboveand below said disks and. the connections are so arranged that when theswitches rest on. the lower contacts a resistance 18 is connected directacross the armature. A car switch. 20 is also provided for operating thecontroller from the car, and for controlling the several circuits abovedescribed. Limit switches 21, 21., 22, 22 for automatically slowing andstopping the car at its extremities are situated on the elevator andoperated by suitable striklng devices in the well. The positions ofthese limit switches can be adjusted independently of each other.

In connection with the solenoids it is preferable to employ a relayswitch 24 on the circuit 8 in order to avoid the necessity of a currentof high voltage in the car when on a three wire system as shown indiagram Fig. 1, whereas in a two wire system, as shown in Fig. 2, saidrelay switch 24 is unnecessary.

With my arrangement-the fields remain excited while the motor isstopping before the brake is applied, and though all current is cut oilfrom the armature the motor runs as a generator with a resistance 18across the armature, and the fields being still strongly excited apowerful retarding effect is obtained which slows the speed of the motorbefore the brake is finally applied to stop it altogether.

hen about to start a car the switch 20 therein is moved over four of thecontacts 25, 26, 27, 28, with the result that,

First,the winding 8 around the solenoid 1 and solenoid 1' are placed incircuit. This insures that the armature resistance 6 is in circuit andthat the main line switch 10, shunt field switch 11 and brake switch 12are closed;

Secondly,-the reversing switch S or S is lifted thus closing thearmature circuit through the armature resistance 6 and series field. Themotor now starts at a slow speed.

Thirdly,Circuit 8 of the slow coils of the double solenoid is broken butno alteration takes place until,

Fourthly,the fast solenoid circuit is closed. The lever 4 now lifts andproceeds to cut out the armature resistance 6 and series field 7 thiswill continue until all the latter are cut out when the motor runs fullspeed. This fast movement can be arrested at any time by returning thecar switch 20 back into the third position (contacts 25 and 27) when thesolenoid circuit 8 is broken; or the motor can be slowed by moving thecar switch back to the second position on contacts 25, 26 and 27 whichresults in the slow coil of the solenoid 1 drawing the rheostat lever atdown again and placing the armature resistance and series field incircuit again.

On returning the car switch 20 to the first position on contacts 25 and26 all current is cut off from the armature 15 and the reversing snitchS or S returns to its normal position. The motor now runs as a generatorwith a resistance 18 across the armature and the fields are stronglyexcited thereby giving a powerful retarding effect and slowing the speedof said motor. By now moving the car switch 20 off the contacts entirelyin the position shown in Fig. 1 the circuit of solenoid 1' and that ofthe winding 8 of solenoid 1 are broken and the main switch 10 and theshunt field and brake switches 11 and 12 are opened thus bringing thebrake into action and stopping the motor and therefore the car. Thedropping of the core of solenoid 1 and its disk 13 forces the lever downif same is not already in such a position.

The car is automatically stopped at the end of its travel by the limitswitches 21, 22 on the elevator as aforementioned, which results firstin the reversing switch S or S being opened thus cutting off the supplyof current to the armature 15 as above described, and secondly, inopening the circuit 9 which applies the brake and stops the motor.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed I declare thatwhat I claim is:

l. A regulating magnet controller for electric elevators comprising arheostat actuated by solenoids having windings with opposite influences,said windings being controlled by the car switch so that acceleration ofthe -motor may be suspended at any speed by the operation of saidswitch.

2. A regulating magnet controller for electric elevators comprising abalanced rheostat lever actuated by a double solenoid, said solenoidhaving fast and slow coils wound in opposite directions and operated.from a car switch, said fast coil being connected respectively with thearmature terminals, and said slow coils with the mains and motorcircuit, substantially as and for the purpose set forth.

3. In a regulating magnet controller for electric elevators a solenoidhaving a winding at one end and connected when in circuit directlyacross the mains and another winding on the same end in series with thearma ture circuit said windings constituting a slow circuit and a thirdwinding or fast circuit on the other end connected across the armatureterminals said solenoid having a soft iron core provided at one end witha rod or projection attached to one end of a rheostat leversubstantially as and for the pur pose set forth. a

4. In a regulating magnet-controller for electric elevators a solenoidhaving a winding at one end connected when in circuit directly acrossthe mains and another winding on the same end in series with thearmature circuit said windings constituting a slow circuit and a thirdwinding or fast circuit on the other end connected across the armatureterminals, a balanced rheostat lever connected to the core of saidsolenoid and adapted to make contact with the rheostat contacts incombination with a single solenoid for controlling the brake and motorsubstantially as set forth.

5. In a regulating magnet controller for electric elevators a solenoidhaving a winding at one end connected, when in circuit directly acrossthe mains and another winding on the same end in series with thearmature circuit said windings constituting a slow circuit and a thirdwinding or fast circuit on the other end connected across the armatureterminals, a balanced. rheostat lever connected at one end to a rod onthe core of said solenoid and adapted to make contact at the other endwith the rheostat contacts in combination with a single solenoid havingan in sulated disk attached to the core thereof, the said. core adaptedto normally rest upon the rheostat lever or the rod of the doublesolenoid and when raised by the single solenoid to close the switches ofthe mains, brake and shunt field substantially as set forth.

HENRY PERCY MoCOLL.

Witnesses 1 EDWARD VVATERs, WALTER CHARLES HART.

